- A low profile gas block should be used if under the forend, we recommend the DPMS Micro-Low profile gas block.

- 308 Rifles: There are two basic types of 308 "size" AR rifles, often referred to as DPMS or Armalite "compatible" rifles. The parts, magazines etc do not interchange. For an easy way to differentiate between the two styles of rifles, look at the rear bottom of the upper receiver. A DPMS compatible rifle has a rounded edge while an Armalite has an angled edge. We offer a coupler nut for both types. DPMS #15060 with a 1 7/16"-16 TPI and Armalite #15061 with a 1 7/16"-18 TPI.

- Forends work with all barrel types that will work with a standard Delta ring.